“Train operators are under pressure on many levels, so raising carriage standards is a step in the right direction.

“Our industry experience and partnership with Omnikote has enabled us to deliver a top product that will last, look good and prevent costly mid-franchise repairs.

“Securing the contract to work with Southern again shows the confidence in our products and services.”

The upgrade affects all three and four-unit class 377 sets that operate on Southern services.

TBM Rail will also replace rubber, silicone and neoprene gaskets during the refurbishment.

Working with fleet operators across the country, TBM Rail also provides seat cleaning services, toilet and tank overhauls, capacitive sensors for door access, and carriage power charge points for travellers.